"Subhash Moond opened fire at Raju Theth inside the jail compound at the time of lunch. Theth got injured and has been referred to SMS Hospital in Jaipur in a critical condition," police inspector Rajendra Rawat said.
Both the criminals are facing trial in different cases.
Theth is involved in various cases, including smuggling, whereas Subhash has been booked in a case of attempt to murder, he said.
The pistol used in the shooting and 10 cartridges were recovered from the spot.